知道什么时候不使用邮件。
Unnecessary when not to allow users to register.
不必要时不要让用户注册。
You gotta learn when not to talk. That is right.
得学着什么时候不该说话才对。
When it's a brilliant love to love when not to return.
当沐浴着爱的光辉时却未能以爱来回报。
Using them well (or knowing when not to use them) is a skill.
使用好模式（或知道什么时候不使用模式）是一项技能。
Learn how to listen - few people do. Learn when to speak and when NOT to.
学会倾听(现在很少有人这样)，知道什么时候该讲话，什么时候不该。
Few months, hard to give someone else (Exchange) When not to pay the workers.
几个月来，辛辛苦苦地给别人(交易所)当了不要工资的工人。
The second step is to know what information to share, when to share it, and when not to share it.
第二步，了解应该分享什么信息、何时分享以及不分享。
The second step is to know what information to share, when to share it, and when not to share it.
第二步是了解分享什么信息、何时分享以及不分享。
It was not in their nature to question when Peter ordered.
当彼得下令时，他们是不会质疑的，这是他们的本性。
I try not to stress out when things go wrong.
出问题时，我尽量不紧张。
They are not afraid to tackle the issues or let the sparks fly when necessary.
他们不怕应付这些问题,必要时也不惜进行唇枪舌剑的激烈争论。
Try not to slouch when you are sitting down.
你坐下时尽量不要无精打采。
When you come down to it, however, the basic problems of life have not changed.
然而，归结起来，生活的基本问题并未改变。
Like many politicians before him, Mr. Bentley did not know when to stop.
如他之前的许多政客一样，本特利先生不知道如何把握分寸。
Be careful not to bump your head on the beam when you stand up.
当心站起来时头别撞了横梁。
Most often we procrastinate when faced with something we do not want to do.
面对不想做的事情，我们经常拖延。
When I was young, we were taught not to dunk.
当我年轻的时候，别人教我们不要扣篮。
But not when the teams are practicing, so you'll have to check the schedule.
但那不是在球队训练的时候，所以你得确认一下行程表。
It may not make you have a strong wish to eat when your stomach is full.
它可能不会让你在饱腹时产生想吃东西的强烈愿望。
When applied to aircraft, the principles are not substantially different.
当这些原理应用到飞机上时，它们并没有本质上的不同。
It would be something to do on this morning when she could not go out.
她今天上午不能出去的时候，就得去找点事做。
Organizers have not said when the song might be ready for the world to hear.
组织者还没有说这首歌什么时候可以准备好以让全世界听到。
It's not unusual to feel lost when you first start college.
刚上大学时感到很迷惘不足为奇。
It is not appropriate to interrupt teachers when they are talking.
在老师们讲话时打断他们是不合适的。
He told her not to loosen the seat belt when he drove.
他叫她在开车时不要松开安全带。
What was my wealth to me when I could not cure my child and make her happy!
当我无法治愈我的孩子并使她快乐时，我的财富对我来说算什么呢？
When people use the Internet, they do not remember the information; rather, they remember how to find it.
人们使用互联网时，他们不会记住信息本身，而是记住如何搜寻到这些信息。
Students should not worry about when exactly to use certain expressions.
学生不必担心什么时候使用某些特定的表达。
Students should not worry about when exactly to use certain expressions.
学生不必担心什么时候使用某些特定的表达。
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